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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb69efabb069b2e5b1ecabf022a469a28ba7832955789f60150d811de4cc739f' 
  AND token = '2QsxNVzbAg5Yv3Mud5xQLtQEoJ413ndvfc8HjwOmM0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}