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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62f473f7078f52c342dc4b7d808c924d6000eed88988b83f1c5ebb75de34ec65' 
  AND token = 'o3079rDlcFLvEMEKNCquXpqv441ajEKg2+5ubpgNrXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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