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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7bc2d2a9255af42371d6dde3d5d219df3259b608229ca3d37a2fae7cd3b8212' 
  AND token = 'bXFTSogERG78YkAdWwTL2QbCyBy2DZAWcKdGdxZSxqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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