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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f6175bbc25826d314f9a5d68a593bab09a328ab5c4bd329b7c9615bac3efea7' 
  AND token = 'cH3gqpbfZwFSVS/lG1UR/wc2KQ6fsdy1p6Gf/MZNEVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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