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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aae16e2fd5d9cb9edf53ed4460cd5dce5598e8a4c34023d9fc22bec1178340e' 
  AND token = 'bcUnKpl/WqXqRAilTYqGgzTu5073i7gunKlahZkdtnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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