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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91b3cd6319cd18b6ddb6ff4c3c9ed335ac412bad796ca793db5489f848c7c774' 
  AND token = 'K/5Bn79d7lar8cBzN0OyQlgt07kq1dhiccJzcD5rtr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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