SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c486858fa92776f5b6b61e067f2f630400a296894fdade734ebc6272424589b' 
  AND token = 'nmMxsfD3C1GKnqkZ4k+k0VfV8vHpKJuR2RDYIAxbY+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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