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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9255bd9b41da1a69e77403ccea0a4aafff4466ced46585b95a72ad3ec153fd58' 
  AND token = '/8z3KHksTcbrd0fx/oN5y8xGg0fDxHzVuioRT2peDKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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