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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6eccb4c9f66c1e71d49f81b080707c94556d7c8a680bed41992bdc4a3a7b5daf' 
  AND token = 'GHv+dbqqGG5cGSCrc1JTzUjPZ59i6byXshkc8HzxzrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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