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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be652515c910206fb3f15da078e9752677b8d4d567f0bb64e83ed61b6552821b' 
  AND token = 'zxTu+SO9gOE2oztbheuoshRmS7rpb8zHfNArsJjB1ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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