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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a35e7741526f4b2a810698637f2918d85715633598ca2f38de6cea88eaa1e6ff' 
  AND token = 'ZvgjCvBNn3ac2TN8bWvkpHcbVdmOWb/0YZ1xi7b/BYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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