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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '023b8296dbf0625745024ba136d68cfb724c6d126ef85697c7b4562a0b61d7a6' 
  AND token = '54g14ZaEq8UB+NNVGUKkE1y5R6zlcWnEcR2hDn6rhZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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