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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdba0b7ac3e9b121b5c140585cce4549cbe35e446c275852e0d8f0cdc1dbdc6b' 
  AND token = 'eUCAzyVHiTHbDsnAT+gW8PhMIApBygchZuttAxPmM/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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