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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46a47461d0045bb4562d800e9b00a8ded480d0e0c42f44e890a46f73f8ff1460' 
  AND token = 'aNmHwlZKS7fdtFYKtMCN1bMwg2UWISa0sw0qdr4NwOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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