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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e67402617df7f92a5705ac57e04c4895f6f0bdbaea6c1863651671b26a91a1d' 
  AND token = 'w0tn5U1JTKqTHhGzX/yRx++fyOhzWTnbXblnebzWwkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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