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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '191a37ce1b8f4a400ab25dfad1218e431bea04e7d02091c030f04a94ecff2520' 
  AND token = '7pNlWUNZkyXZG7bZ8eK8GDbOkKlmPAy4dNS8UJDC1xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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