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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ae623cecd138c68372de3c6d9f2229715c6f913114bf8edc110b75335f9161a' 
  AND token = 'JcRbqL7dufsq5LyYd3QhpueEPqfY/RdA4tTxXSVE09g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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