SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37484f2c029a614ab0c54ad6d3829556f7d276b0f8534b98c929cb50d25a0991' 
  AND token = 'BSnZAOC7BxGiTP38zxm0fhHNwPw7wjsIjE2T1UhKVNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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