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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6cef47a759ee57f0c682a6918f9de1512129f11d6ac79240b52e4e08a624599' 
  AND token = 'z2VJL07pX80X1fe8SzHpT5ehrBTqg3a9dr5zPws4Ur0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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