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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f8b4fcba02280d1c1dd522da2eac82f48edfc9f0a920b7a3860f66b8a4a65ad' 
  AND token = 'p7X6EbGwL+Iw7hUs4V1XYHYyUHkIcmCrcaVLbPu14mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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