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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af7eac251c71103e0f4555783320b6d9cbf3fd313a97499e9c5d7d6a47d259d2' 
  AND token = 'VPZgWkIKBs/yWpaJ7pZNg0IoahTyBFCpu9gZUtTdefY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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