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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1ffb83453af750560a51a65cc78a2cb3d5834c92f129d9017dfd39bec0f26d9' 
  AND token = 'rhu5jgp9EhfCuG8yQhH9ThqJFAr2P1cTGiWOEH2twO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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