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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '429ee02cb8da5296e067a7ff755b5aec4f4f749090192b36a447086cd50ac7f3' 
  AND token = 'QgTFFA45vq8goENUKIHgc8ySw4dsatJWwGzDiOnOWm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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