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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f1fd3a55dda4a6c0daca43f7c92a1c893744d38ffbd6a2610057755edd80cc9' 
  AND token = 'x2UepQ0qDWXEG8hA1irEqQxQDxK+Q5HWppmuUtDY7V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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