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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68f2ca19d466d9e8a98161a46c5c1ccaddcbb467ba19b255324c0a95c2b3c525' 
  AND token = 'ZpUGtJYeX0GSkJHUM0M2fVrXtWUjZ2JdRehuRHG9HBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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