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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4219311a776a1e14216445c1737893b6e17d569449fe1300a4eb4c6b62de008' 
  AND token = 'tuNjilU2j58N20k3Oi2dpbHdlEr0Jv1EBrvGpBY+51Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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