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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '814f101c70e58f59e308340cd200fc09d7d25d5b752f2fb29a3a036e1c78ea51' 
  AND token = 'LDjf2nTyJ5sfK6e+HKqg5haaX6e5N67DSNcyKHW2C6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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