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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d7a2488de85824b8232458d06e39f46d1bf5eec5beea0c17d0537c7389714c2' 
  AND token = '+qoshAB4pio1n/7HleNMWlwHPxHFd+7Xg4eINu8nq+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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