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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ce9c4842732120a8723c3ad08cfad97e6c0f5b4ac46698037395ea47f36a373' 
  AND token = 'FvedEefSzQpqTzTUBwxcubGr7s8033TlegJblHMlRms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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