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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0ae01616de4900e597d3e2e9a8e6cee50b7dac9666fdff55c3d8ce3798bf0ed' 
  AND token = 'fM7Mb2yMlejSiN/W7X1gbT95h5oe2lRqh/RF7Ct9oOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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