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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d1dee2e0dbc570b8b83a2c399bdc78e0988549baaca1de9bbd21e00224f46fa' 
  AND token = 'SnYb9N1DKTXsx/J0x4pz8uuZo9lz8kL/1LXrPNl3nOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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