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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a6efe1f46746c2209f1445b8d3a1bc46f9672eb4be7b46a4a4bfc323d9e5169' 
  AND token = '1pXX9u8Gl7lE1AmVOIN94GOYyEMlDhUMFh/tVKKMOUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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