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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '786cd4aaf89befe492daeca14fc4a97436c723846e16af2d775463da1c81134b' 
  AND token = 'jj38adTDJWvNEUW+3KZ2/9w+Fb+qDAzIiLlu4R718AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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