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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d6463ff1bfb7d8675d9dcaec2dee37418bcc52d15dd11dfd07407bc368d13d1' 
  AND token = '0FoAfAaGTIYkmVjB4d4z9zwuaLpICDXYu1TRFRPH3yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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