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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fb1dd2342a402587a21528518722b3e569cce520ea3b944194825ad5abd84c4' 
  AND token = 'oPRE4MRYl4fmk8J6bGFsaCYYHXr43z25NtWZHj+rUkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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