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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '683d4b13a1c1c7a6dc0b5700b7dabaf812668bae6a64d9aa1e8fab5e5f602865' 
  AND token = 'NNVFJDs72Pr4ItxBNpaXbVPk+usBWYHWCKcinUSxniM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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