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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '310f51a31c71d85c9138c68da0ce512e29cbcbe5720376f963f1f6897595cd12' 
  AND token = 'XJi4gNmDSbjkSIXQaBGhmrR8hWnJQejnPOuT6Z77X0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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