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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fe729043ee6107b604e024fbb65d8e0889a426d3bd7c2c880d3f30eb5d614a5' 
  AND token = 'pHWk1NC1uI8tUYId7ommLln6w+od1lAXxwwwOnm+zu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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