SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '311cb0cf44e20e3ed527df262abff5e77458f122eb78f6da1289e5bcc6b810f9' 
  AND token = 'HqzD2SHATwdZADr+Cp6FIw9siNEweKdbA+/qBYJ+ggQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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