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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '538713828102a2e769fbf6b69bc86bfed9f9d460f208601b2d8170799933ed35' 
  AND token = 'yEl0ptXecPhwyaXZdBZPhQVh5CfnIgyqkLr1dVs3e8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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