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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e7daceaaeca6115b66f214fa5b461c97b2d29e5d1bd71cf6aa4836665b6f3b6' 
  AND token = 'THh9j+n2dpjzVKzrjShkJTbd4st+F7TuY57k5PE1K4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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