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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '367744ac06cab0450d61b4bdc115234fefb9fb3ce1a5ab864df0984cd566feb4' 
  AND token = '8SNWYFPD0YIGw2w1gpo66yZvUovlJp9HMN3ydPQzA6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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