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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10bbd47a96c0f407f3ba1844ca20342a3cea5d7fa5949bb2895baf84f8f4c009' 
  AND token = 'V47kPLpHY5zQ+Xml6PVMI1yHm0yMC34ZjElDCqsxnps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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