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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13bd11ef1330aa253e6d350a11f5383bc56c807911958310aa7ea58caea483a8' 
  AND token = 'iN+chxTfpk63BtEhbDG/zae1hDy5u06nwNvIIpgeYH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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