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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2ec7feab8cd34df2743e85ec0d36c48ca928d8422593d3f574c9c4a2ee72ca1' 
  AND token = 'zEmfKqAhub1Wip4xDy0c33BUDKLylPKjf3CvSig8VjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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