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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c88af79a3ae0039c89716e83918be01f2115a4ba0fd140b0ce40806f4ca119a6' 
  AND token = '0GGMeV7Zh2j3McSXF7pPOvggrt7YYcbuifiRytKw8Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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