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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29a55d3d9784be390cd3353f0cbaf1ac3165a8291ce1933b71a61e1ef6984bb9' 
  AND token = '67ybpSb0Ah7z8/cg9s8/mybp2hNalMTU6j0xbagd1Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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