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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47936a9db265df0971007ff7da00262239d25973934508a1a8a671292c59bbc5' 
  AND token = 'U4v9Ys34SYQ9s7euYZPPP8DGJ5nLYD29uGpk86SKfLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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