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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2f64014a363ab0b0a840d723705453f2580446c90765defb5618be516ec45b4' 
  AND token = 'Cfqtvue0n54aTz2u/haK2TTQOZareJgf+oyhnZQOmWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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