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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5158de8499e6431d8b76e91987d097e5dd8a05bda4be140db29562c158e4a33' 
  AND token = 'FXw4KeQH0AKUgfoWpYe/C2ITnu07nKRHF/BIflTsDBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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