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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3ce53fba476b5515e6db05a7278cfcf4f9374d25c7d0a60b5f166f56bda88f5' 
  AND token = 'Xey+kgWOh7ZxI3yiO2NKczuzOqaj0RhhF0423A1yO6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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