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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d17d1c7104e9d803b196ea363a864f491ef8b876a0c7f00a7a119a75ddb34e2' 
  AND token = 'CMJ6JOQe58ZWDJLH9Lq79As4+LqmaUO8fr2BBTLjyco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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