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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a35c559d1663232623b65112677fc6764e79e7b39e120f0685f376ee4068eff2' 
  AND token = 'HeK9wCTitJhjn5guUzM7n5HAguPEYpMmkyc0636c2Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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