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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6592b53ca5d1b4e79356fa7ccc5bb33f2ea1b5d4cea5195d46188ec5fa327bf0' 
  AND token = '8SbCbbhOfSdVvzoqm6MMwW6HadWwk9X8R5P8Ognu1PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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