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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09adf06bc7ba5c8854379f59f47400915e3aae905ecdd0e0ccedbf8562003d27' 
  AND token = '2/T3haH1+kiP2WAeXxTFqQ5rI9UkdE8aq8bdrkTtjbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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