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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffa224a13a167d1e78b1f9d3488bdb7eb963c6a7a798640278f12113aa5cc061' 
  AND token = 'nFwwiXHbiRZigDLmNNffezhu8ZS0yXan9W50/MkFFJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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